Question

if a price of a book is reduced by RS 5 ,a person can buy 4more books for RS 600. find the original price of the book​

Answer 1

Answer:

let the original price be x so,

600/x-5. - 600/x=4

600x-600x+3000/x2-5x=4

3000/x2-5x=4

3000=4(x^2-5x)

3000=4x^2-20x

4x2-20x-3000=0

x^2-5x-750=0

x^2-30x+25x-750=0

x(x-30)+25(x-30)=0

(x+25)(x-30)=0

x=30,-25

price cannot be negative

so 30